A spokesman for Three Mile Island in Dauphin County says an electrical short on a motor caused a brief fire at Three Mile Island on Monday night.

The plant's on-site fire crews were able to put the fire out quickly.

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According to the spokesman, the fire caused no impact to the plant or to public safety.

Tuesday morning, the National Regulatory Commission announced that it was looking into the incident. Here's the full news release from the NRC public affairs office:

"The U.S. Nuclear Regulatory Commission (NRC) is continuing to follow up on the “Alert” declared just after 9 last night at the Three Mile Island 1 nuclear power plant. (An “Alert” is the second-lowest of four levels of emergency classification used by the NRC.) The “Alert” was declared in response to a fire in a pump that is part of a system would be used to help remove decay, or residual, heat following a reactor shutdown. The pump’s motor and electrical breaker were affected.

The plant’s on-site fire brigade responded and promptly extinguished the fire. The plant also requested off-site firefighting assistance (Londonderry Fire Company), but it was not needed.

After checks were conducted, the “Alert” was cancelled at 12:09 a.m. today.

There was no impact to normal plant operations and the reactor continued to operate at 100-percent power. There were no injuries or off-site impacts.

One of the NRC’s Resident Inspectors assigned to Three Mile Island 1 on a full-time basis responded to the plant and performed an independent assessment of operator actions, equipment response and any damage. No immediate performance deficiencies were identified.

The NRC will follow up on the company’s review of what caused the fire and repairs. The portion of the decay heat removal system affected by the fire remains out of service pending repair work."